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[SOLVED] Bootloop when trying to downgrade from Android 8.1 (LineageOS 15.1) to 7.1.

I have the following installed:
[url]https://forum.xda-developers.com/oneplus-one/development/8-0-0r3-lineageos-15-0-t3670670[/URL]
Android: LineageOS 15.1 (8.1.0_r4) with latest magisk installed (15.3) with unofficial opengapps 8.1 mini package
When I try to downgrade to either Lineage 14.1 official or carbonrom 5.1 I am getting a boot loop at the oneplus logo. Restoring from backup to 8.1 resolves the issue.
1. factory reset
2. wipe system
3. Install Lineage 14.1 or carbonrom 5.1
4. Install recent opengapps mini package for 7.1.2
4. Reboot
The phone boot loops at the oneplus logo and I end up restoring from backup.
I have looked online and was struggling to find anything relevant. Some people report a new battery solved the issue but since It works when I restore from the backup It doesn't seem to be that. I do have a new battery on hand that I am eventually going to install though so I can do that.
Apologies if I am missing something obvious.

-Snowrider- said:
I have the following installed:
https://forum.xda-developers.com/oneplus-one/development/8-0-0r3-lineageos-15-0-t3670670
Android: LineageOS 15.1 (8.1.0_r4) with latest magisk installed (15.3) with unofficial opengapps 8.1 mini package
When I try to downgrade to either Lineage 14.1 official or carbonrom 5.1 I am getting a boot loop at the oneplus logo. Restoring from backup to 8.1 resolves the issue.
1. factory reset
2. wipe system
3. Install Lineage 14.1 or carbonrom 5.1
4. Install recent opengapps mini package for 7.1.2
4. Reboot
The phone boot loops at the oneplus logo and I end up restoring from backup.
I have looked online and was struggling to find anything relevant. Some people report a new battery solved the issue but since It works when I restore from the backup It doesn't seem to be that. I do have a new battery on hand that I am eventually going to install though so I can do that.
Apologies if I am missing something obvious.
Click to expand...
Click to collapse
Try the following :
-uninstall magisk using uninstaller(available in magisk forum)
-clear system,data,cache,dalvik
-install only the rom with out gapps
if it boots properly then you can install the gapps later or else if u find flashing gapps is causing the bootloop then use an older version and double check the compatibility.
if still not just try out another nougat rom

Thanks for the suggestion.
I tried your steps with the latest stable slimrom 7.1.2, lineage 14.1 and carbonrom 5.1 and I am still seeing the same issue. I was able to clean install the lineage 15.1 beta I linked to though in addition to restoring my backup as I have done before. I might try to clean install a different 8.1 (AOSP for example) and see if that one works. This will help narrow down if the issue is caused by 8.1 in general or specifically something that the lineage 15.1 beta has done.

I had a similar problem when I flashed Sultan's LOS14.1. I fixed it by flashing down to stock using wugfresh's bacon root toolkit. Keep in mind though that this will wipe EVERYTHING on your phone. Hope it doesn't come to that. Best of luck!

CedArctic said:
I had a similar problem when I flashed Sultan's LOS14.1. I fixed it by flashing down to stock using wugfresh's bacon root toolkit. Keep in mind though that this will wipe EVERYTHING on your phone. Hope it doesn't come to that. Best of luck!
Click to expand...
Click to collapse
This is what I ended up doing and it did the trick. Thank you for the suggestion.

Stuck on boot animation!!!

I was using Resurrection Remix 5.8 on my Nexus 5 after that I installed first ever rom 8.1 oreo by restoring method in TWRP recovery and after that I tried to install Resurrection Remix 6.0 unofficial (wiped all data excluding internal storage) after that my phone was not booting up and stuck on boot animation after that had I tried all roms of Android 8.1 Oreo all roms were having the same problem stucking on boot animation.
I also updated my TWRP recovery to 3.2 THEN ALSO SAME PROBLEM.

I also faced this issues a week ago. I just flashed stock Rom using fastboot method, then reflash TWRP & DU Rom (8.1)

asp_007 said:
I was using Resurrection Remix 5.8 on my Nexus 5 after that I installed first ever rom 8.1 oreo by restoring method in TWRP recovery and after that I tried to install Resurrection Remix 6.0 unofficial (wiped all data excluding internal storage) after that my phone was not booting up and stuck on boot animation after that had I tried all roms of Android 8.1 Oreo all roms were having the same problem stucking on boot animation.
I also updated my TWRP recovery to 3.2 THEN ALSO SAME PROBLEM.
Click to expand...
Click to collapse
Check and see what your partitions are formatted to. Try formatting them except internal to EXT4. I'm pretty sure first ever is f2fs and I think Resurrection Remix 6.0 needs to be EXT4 (I could be wrong).

kingd421 said:
Check and see what your partitions are formatted to. Try formatting them except internal to EXT4. I'm pretty sure first ever is f2fs and I think Resurrection Remix 6.0 needs to be EXT4 (I could be wrong).
Click to expand...
Click to collapse
Ya, it's f2fs

asp_007 said:
Ya, it's f2fs
Click to expand...
Click to collapse
Try formatting to EXT4. That's how I got DU 12 to boot, and I haven't had any trouble flash any Oreo Rom.

kingd421 said:
Try formatting to EXT4. That's how I got DU 12 to boot, and I haven't had any trouble flash any Oreo Rom.
Click to expand...
Click to collapse
Can I flash Resurrection remix 6.0 on RR 5.8

asp_007 said:
Can I flash Resurrection remix 6.0 on RR 5.8
Click to expand...
Click to collapse
Clean flash be your best bet.

Bootloops when clean flashing a ROM, only certain ROMs work

I'm on the official build of LOS 14.1. I've tried flashing other ROMs on Nougat but i bootloop on every single one. I clean flash too. I make sure to wipe everything besides internal storage. I had an older version of TWRP . it was like version 2.8 or something but i just updated it to 3.2.1.0 and it still doesnt let me flash ROMs. I tried flashing Oreo based ROMs and it does the same thing. I've only been able to successfully run the official LOS 14.1, and CM 13.1 (havent tried 14.1). I've tried different variants of LOS on 14.1 and 15.1. Is there something that i'm missing? if it helps i found my old OPO and havent used it since january 2016. I decided to try out new ROMs but they're not booting. Any help? Thanks.

Constant Reboot

I had the official Lineage 15.1 installed with gapps pico, it was upgraded from 14.1 lineage with gapps pico + magisk 16 . Today I wanted to downgrade back to 14.1 so I flashed the latest 14.1 lineage with gapps 7.1
After booting it shows com.android.phone has stopped working and it restarts again to show the same thing.
I am able to get into TWRP recovery , can anyone please suggest me what should I do?
I dont have previous backup

Mmodi said:
I had the official Lineage 15.1 installed with gapps pico, it was upgraded from 14.1 lineage with gapps pico + magisk 16 . Today I wanted to downgrade back to 14.1 so I flashed the latest 14.1 lineage with gapps 7.1
After booting it shows com.android.phone has stopped working and it restarts again to show the same thing.
I am able to get into TWRP recovery , can anyone please suggest me what should I do?
I dont have previous backup
Click to expand...
Click to collapse
I did a factory reset using TWRP . Lost all the data but the phone started, able to use it now

Mmodi said:
I did a factory reset using TWRP . Lost all the data but the phone started, able to use it now
Click to expand...
Click to collapse
Always do a clean wipe (wipe everything except internal/external storage). Always back up your previous system just in case. Sometimes it is better to flash Gapps right after flashing the ROM, sometimes it's better to flash the ROM, boot and then flash the Gapps.

doubt about flashing a custom rom

guys,i am currently using lineage os 15.1 official..if i have to flash another custom rom , which twrp i have to use..whether the offical twrp or lineage based twrp

dharun005 said:
guys,i am currently using lineage os 15.1 official..if i have to flash another custom rom , which twrp i have to use..whether the offical twrp or lineage based twrp
Click to expand...
Click to collapse
Lineage based is fine, I was on 15.1 official , then switched to Aex with same twrp with no problem whatsoever.

thnks fr ur reply.i installed lineage without changing it to ext4.so my doubt is if i have to change it frm f2f to ext4,can i use lineage based twrp to format data or i have to switch back to original twrp to do the process.

dharun005 said:
thnks fr ur reply.i installed lineage without changing it to ext4.so my doubt is if i have to change it frm f2f to ext4,can i use lineage based twrp to format data or i have to switch back to original twrp to do the process.
Click to expand...
Click to collapse
Lineage based causes issue with formatting data many a times. But in my case if u first change data to ext4 ,then wipe data then all is fine.
But users have also reported bootloops and decryption issues with formatting data with LOS twrp. So for safety, formatting data with official twrp is best but in my case former worked for me.

Hi
I'm currently on crdroid . can i flash los or aex with dirty flash?

mysteres said:
Hi
I'm currently on crdroid . can i flash los or aex with dirty flash?
Click to expand...
Click to collapse
Man, dont dirty flash one rom over other. The pain of clean flash is way less than dirty flash with problems.

dharun005 said:
guys,i am currently using lineage os 15.1 official..if i have to flash another custom rom , which twrp i have to use..whether the offical twrp or lineage based twrp
Click to expand...
Click to collapse
I couldn't get the Lineage OS TWRP to work as it couldn't mount the data partition even though it re-formated it to ext4.
Official TWRP worked first time.
Hope this helps.
Good luck!